Peertube has other advantages, among which interoperability. A relevant quote from the main developer:
“Where it gets really, really exciting, is that when you respond to a video status on Mastodon, the message will be sent to the instance of PeerTube. Your response will thus be visible beneath the video, in the comment space. And yes, if another person at the other end of the world responds to your comment via their instance of PeerTube or Mastodon, you’ll see it as a response to your status in Mastodon. If tomorrow Diaspora (the Facebook alternative behind Framasphere) implements ActivityPub, it will work in the same way. We’ll have plenty of platforms that are capable of federating comments.
Free alternatives are criticized, often rightly, for not having added value compared to centralized platforms. With ActivityPub, we now have our first big advantage. Because on the centralized platforms, you’ll have a hard time viewing, under your YouTube video, the reactions of people who commented on Facebook, Twitter, etc. ”
source: https://medium.com/@chocobozzz/peertube-a-federated-video-st...